On Thu, 17 May 2012 13:52:13 +0400 Glauber Costa [off-list ref] wrote:

Andrew is right. It seems we will need that mutex after all. Just this 
is not a race, and neither something that should belong in the 
static_branch interface.

Well, a mutex is one way.  Or you could do something like

	if (!test_and_set_bit(CGPROTO_ACTIVATED, &cg_proto->flags))
		static_key_slow_inc(&memcg_socket_limit_enabled);

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